diff --git a/src/main.cc b/src/main.cc
index 819100e47..72de189d8 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -24,7 +24,6 @@
  * Red Hat Author(s): Behdad Esfahbod
  */
 
-#include "hb-mutex-private.hh"
 #include "hb-open-file-private.hh"
 #include "hb-ot-layout-gdef-table.hh"
 #include "hb-ot-layout-gsubgpos-private.hh"